New collection of seamless textures was added at assistcg.com: "Stone Walls". http://www.assistcg.com/index.php/component/image/category/59.html Note some changes were made. Currently, every registered user can download three textures for free.
http://www.assistcg.com/ is online resource of seamless textures 1024x1024 px. Currently, every registered user can download one texture for free. The full access to the textures is carried out on a subscription basis. Currently, the cost of monthly subscription is $10. The cost of six months subscription is $30. Also available HD video transitions 16:9, which can be downloaded freely upon registration.